So you start with a GM made pair of wood armor. Make sure you craft with GM arms lore and that your base resists are where you need them to be (generally a majority of an outfit is artifacts, so it's easy to calculate which resists are most important for you).
Once you have a good base piece, hit it with runic reforging using an ash runic saw. Choose Powerful Reforge, Grand Artifice, and Inspired Artifice. This uses 4 charges and allows you to choose 1 name for your armor piece. Pick Towering of Aegis.
What you're hoping for is 1-2 mods, with one of them being 5% DCI. Once you have that, then you set it up for the next part: Enhancing with Heartwood.
This part sucks. You have approximately a 1:8 chance that the enhancement will add 5% HCI. It could do something else. Best chance for success is using the forged tool. I burned about 8 charges before I made my pair.
After you have your 5% HCI and 5% DCI piece, then you powder it up to 255, then you can imbue it.
Here's my legs after I finished the final imbuing:
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